What Causes Green Screen/Lines on iPhone?
 
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If there is a green line on your iPhone screen or the screen is completely green, it means your device is having trouble identifying the display. Typically, there could be several reasons for the iPhone green screen/lines problem. The possible causes include:
Improper Settings: This green screen/lines issue can be caused by the incorrect display settings of your iPhone. You can adjust it back to normal or reset all the settings.
System Bugs: iPhone green screen/lines issue may also occur if you are using an outdated iOS system. You can have it fixed by updating your iPhone to the latest iOS version.
Damaged Screen: If your iPhone is experiencing a hardware problem like a damaged screen or driver circuit, you'd better contact Apple Support to repair or replace the display screen.
 
Updates or bugs in the iOS can cause the green screen issue. Incomplete or corrupted updates are often the culprits. Hardware Issues: Physical damage or internal component failures can lead to display problems. A drop or exposure to moisture can damage the screen or internal circuitry.